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What is the ringwoodite theory?

The ringwoodite theory centers on ringwoodite’s capacity to store water within its crystal structure. It suggests that the total amount of water stored in Earth’s mantle transition zone could be nearly three times the volume of water in Earth’s surface oceans. This capacity supports the concept of a deep water cycle, in which oceanic water carried into the mantle at subduction zones can be retained at depth and later returned to the surface over geologic time.